-9=7-8y

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Solution for -9=7-8y equation: 



-9=7-8y

We move all terms to the left:

-9-(7-8y)=0

We add all the numbers together, and all the variables

-(-8y+7)-9=0

We get rid of parentheses

8y-7-9=0

We add all the numbers together, and all the variables

8y-16=0

We move all terms containing y to the left, all other terms to the right

8y=16

y=16/8

y=2

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